Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Webby the Bear on 16 September 2013, 12:48:29
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Hi guys,
Got my cylinder heads cleaned up and my block mating surface cleaned up. Head gaskets being delivered as we speak. Head bolts from GM.
1.) What's the part number for the green sealant?
2.) What's the green sealant for? Apart from to help seal corroded parts of the cylinder head? i think Mark mentioned front bearing cap..... can someone tell me exactly where this is to go :)
3.) i have 3 earth leads that came off the LH cylinder head.... but i'm buggered if i can remember where / how they go on. they came off with 3 bolts but there arent 3 holes to screw them in to ???
4.) is there a gasket to the downpipe to manifold connection?
5.) if i was really broke, like i am :( can i get away with using old manifold gaskets? as they werent leaking before
please forgive my stupidity on the abopve questions. first time ive ever done this and just making sure i get everything right. :)
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Am about to get abused for this,by the purisit police.
manifold and downpipe gaskets can be reused, put a small bead of silicone sealent on both sides of the gasket and tighten up. You wont ever get a blowing manifold again, use clear silicone sealent from local diy shop,.
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Cheers BG :y :y
Any idea on the other questions?
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I think there's a bracket on the back of the cyl head,near the coil pack.guessing the bolts are 10mm socket, :-X
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hmmm. it may have come off and be laying in my parts pile somewhere ::) ive tried to be as sensible as possible with keeping bolts and brackets etc together. but seriously, the amount that have come off is ridiculous. ;D
ps, the silicone sealant.... is that just the stuff for the bathroom? got plenty of that i think
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ps, the silicone sealant.... is that just the stuff for the bathroom? got plenty of that i think
Never use that anywhere on a vehicle - unless it's got a bathroom in it. ;)
Bathroom silicone gives off acetic acid as it cures, which will wreck lambda sensors.
I would replace the exhaust gaskets, TBH. They frequently give problems on the 2.5/3.0, so do them while you can get to them rather than have the @rse of a job that is replacing them later.
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;D ;D ;D
Just being at school monies are a bit tight and if i can get away with it would be sooo good. but ill prob end up getting new ones :)
Any idea re the sealant and the earth connections? :)
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;D ;D ;D
Just being at school monies are a bit tight and if i can get away with it would be sooo good. but ill prob end up getting new ones :)
Any idea re the sealant and the earth connections? :)
theres a metal silver bracket that the coil pack bolts onto, it has the three holes in it for the wires. DO NOT connect them all together.
:y jon
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Cheers RB. Just spoke to martin and he confirmed the same :)
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yep, if you connect them all together it will run like a bag o nails. lol. been there got the T shirt. ::)
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Cheers mate ;D ;D ;D
what are they for out of interest?
and any idea where i put this green sealant and the part number? :y
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Cheers mate ;D ;D ;D
what are they for out of interest? cant quite remember tbh.
and any idea where i put this green sealant and the part number? :y.......Nope sorry.
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Any idea re the sealant and ........
I think Marks referring to adding a little under the actual bearing cap that the lip seals for the cams sit in
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Thanks boys.
As usual i'm a bit confused as to where this is so i'll post up a photo later of where i think youre talking about lol
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Thanks boys.
As usual i'm a bit confused as to where this is so i'll post up a photo later of where i think youre talking about lol
If you remove the Torx bolt that's only just in view (& its mate) this is holding the cam in place (along with the others along the length of the cam), but it also needs sealing to prevent oil escaping from the front of the head. The oil lip seal goes into the front of the cap/head ...... ignore the black sealant - it's sealing the cam cover to the head
(http://images.omegaowners.com/images/guides/v6_camcover_gaskets/IMG_0904.jpg)
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ThanksAndy, that makes perfect sense. so this stuff is just for the first cap then?
And heres a pic of where it will ooze out of when fitted.... just so I know ive got this right ;)
(http://i1226.photobucket.com/albums/ee402/webbybear1/camcapii_zps1c899f4a.jpg) (http://s1226.photobucket.com/user/webbybear1/media/camcapii_zps1c899f4a.jpg.html)
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ThanksAndy, that makes perfect sense. so this stuff is just for the first cap then?
And heres a pic of where it will ooze out of when fitted.... just so I know ive got this right ;)
(http://i1226.photobucket.com/albums/ee402/webbybear1/camcapii_zps1c899f4a.jpg) (http://s1226.photobucket.com/user/webbybear1/media/camcapii_zps1c899f4a.jpg.html)
Just out of sight of in that pic, behind the blob of sealant, is an oil hole. This should not be blocked!!
Soz, cant answer the green sealant Q
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ok thanks TB. LOL I know im going to balls this up ::)
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ThanksAndy, that makes perfect sense. so this stuff is just for the first cap then?
And heres a pic of where it will ooze out of when fitted.... just so I know ive got this right ;) ....
I do confess that it's a job I've only been involved with once (Ian_D's car), but reading the description you gave & what you said Mark had said, this is the only place I can think of,
so in answer to your question of where it'll ooze from .... yes! But you only need a smear, so don't expect it to ooze out too much. :y :y and careful of the oil hole that The Boy mentioned. :y :y
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ok cheers matie :y :y :y :y
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ok bit confused chaps....
took the end cam cap off and it looks like the oil passages go through the whole of the bottom of the cam cap and also the head where they attach also. are you guys sure I should be putting any sealant in this area? when I put this sealant on and refit the cam cap theres no 100% im going to leave this oil way clear
(http://i1226.photobucket.com/albums/ee402/webbybear1/camcapthree_zpsf7ad80c5.jpg) (http://s1226.photobucket.com/user/webbybear1/media/camcapthree_zpsf7ad80c5.jpg.html)
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ps this is me just giessing that the semi circle ''track'' running round the bottom of the cam cap has oil going through it :)
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ok bit confused chaps.... .....
On seconds thought, you're just putting a spot of sealant towards the front of each side of cap ...... you're just making the front of cam cap oil tight
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ok bit confused chaps.... .....
On seconds thought, you're just putting a spot of sealant towards the front of each side of cap ...... you're just making the front of cam cap oil tight
ok got ya. thanks andy :y :y :y
seriously if i get this car started and it runs ok it'll be a bleedin miracle ;D
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ok bit confused chaps.... .....
On seconds thought, you're just putting a spot of sealant towards the front of each side of cap ...... you're just making the front of cam cap oil tight
ok got ya. thanks andy :y :y :y
seriously if i get this car started and it runs ok it'll be a bleedin miracle ;D
Remember that each cam bearing cam should go back where it came from - they're line bored and so a matched set to a head - assemble all the cap on the head over the cams & very very gradually tighten them all up evenly & progressively until they're fully nipped up. Then use your torque wrench.
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That's a good example of why you don't use the RTV sealant there, as it looks like someone has. You need something that only cures in the absence of air.
Those passages deliver oil to lubricate the cam bearing, and also allow oil to drain away from behind the camshaft oil seal. They have been partially blocked by previous work by the looks of it.
Clean the passages out and put a tiny smear of the green sealant on the front of the head, forward of the two diagonal passages that relieve oil from behind the seal, i.e. just the faces either side of the oil seal. Too much sealant and it will squeeze out on tightening and block the passages. This is the passage that TheBoy referred to earlier. Block it and the oil seal will leak!
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Fairly sure green sealant is 1#90542114 Gr.8.768 15 03 170 thats the info on my tube.
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Thanks for the info guys. think i got it. a SMALL amount :y
thanks for the part number also robson :y :y
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Yes, a small wipe.
As for the manifold gaskets, if they are the old composite ones then bin them, there is an updated metal multilayer one that is MUCH better.
As for silicon sealant the silicone can also damage the cats and it wont withstand the temperatures associated with the exhaust system.
If the front pipe to manifold gaskets look ok then re-using them is lower risk adn there not to demanding to change if there are issues (where as manifold gaskets are)
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Yep fair play Mark ill swap them out. i dont remember a gasket coming off the downpipe to manifold connection and after double checking with martin i was right. if i inspected the downpipe is it likely id find a baked on gasket?
ok, when im putting this lot together where should i lubricate with oil? im thinking valve tops, tops of lifters, under cam caps (ones behind front ones)? :)
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..... i dont remember a gasket coming off the downpipe to manifold connection and after double checking with martin i was right. if i inspected the downpipe is it likely id find a baked on gasket? ....
There's just a simple round 'asbestos' gasket that sits on the lip of the exhaust down pipe as it bolts to the manifold. Last year (or the year before :-\) I paid someone else to replace the rear crank shaft seal which meant dropping the gearbox which meant dropping the downpipes. Needless to say, they didn't replace the gaskets & used exhaust paste which only lasted a short while.
I forget now how much they were from Vauxhall, but I was surprised at how much they were for something so small :(
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..... i dont remember a gasket coming off the downpipe to manifold connection and after double checking with martin i was right. if i inspected the downpipe is it likely id find a baked on gasket? ....
There's just a simple round 'asbestos' gasket that sits on the lip of the exhaust down pipe as it bolts to the manifold. Last year (or the year before :-\) I paid someone else to replace the rear crank shaft seal which meant dropping the gearbox which meant dropping the downpipes. Needless to say, they didn't replace the gaskets & used exhaust paste which only lasted a short while.
I forget now how much they were from Vauxhall, but I was surprised at how much they were for something so small :(
Do they have tiny little holes in andy? seem to remember when i looked at the downpipe there was something round on there that looked like that....
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Do they have tiny little holes in andy? seem to remember when i looked at the downpipe there was something round on there that looked like that....
Not holes as such, but dimples on the surface. :y
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There a copper type affair and probably stuck to the tops of the front pipes.
Fit the heads and then put some oil on the cam bearings and follower tops, lay the cams in and lube the top sides of the cam where the bearings are and the lobes.
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Thanks for all the info guys.
And yes Mark, thats exactly what it is :)
going to be progressing as soon as the head gaskets turn up ::) :y :y :y
got the heater on yesterday too...... dont want the inside going all damp while its not in use :y
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There a copper type affair and probably stuck to the tops of the front pipes. ....
The gaskets I bought from Vauxhall weren't, more of an 'asbestos' type
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They do appear like that but when you rip one its made up of what appears to be copper flakes bonded together. I reality I have no idea what ther made of!
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They do appear like that but when you rip one its made up of what appears to be copper flakes bonded together. I reality I have no idea what ther made of!
OK I never got to see the originals. Why do garages not ask you whether you want the correct gaskets/parts fitting to do the job properly or whether you're happy for them to bodge the job now so that you can do the job properly yourself a later date? ::) ::)
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webby they are round rings mate-forgot to give you them-sorry :-[ :-[
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no worries mate. I still gotthe ones that are stuck to the downpipes ;D